http://www.velonews.com/article/9761...spite-riding-a
This is a good starting place for the way you think about food. No need to obsess, just consider what it is you are putting into your body.
Do SOMETHING everyday. Whether it's a ride, a 2-hour walk, a stroll through town or a museum, get on your feet and be active everyday. Canceling your TV's cable service is a good start.
And with regards to eating fat: learn about it. Find out which sources are good (nuts, avocados, olive oil) and which are bad (all fast food) and eat them all you want. Humans are meant to be active, which requires endurance, and the best way for an endurance athlete to fuel is through good, healthy fats.
Decide to change your life, and the way you think about what you eat and how you treat your body. Diets are what Americans latch onto because we generally want things to be quick and easy with amazing results. That doesn't happen. Be patient, learn about your body, push it to new limits, and treat it well with a healthy, balanced way of eating. Also, drinking a gallon of water a day will do wonders for you.